Why do some parents expect relatives to provide free childcare?

Its like one forced people to have kids instead of talking about coming up with a plan some people have kids layer guilt trip family members about not helping out to become their kids nanny. My sister has done tricks to my mom showed up no phone called or text just showed up and expected to what her spoiled brat. Now my sister try to do the same thing to me I never open the door she called while she was at my front porch I told her the andwer is no I had to work yet she insistes to called of work so that I could be a nanny for that day andswer was no. She gets angry woth me called me names and claim that my mom and I are selfish when all I did was setting my bounderies the whole argument went threw a phone called. My sister kid is spoiled to the point my nephew would turn my living room into a football feild that kid throw a tablet at my face laugh at me called me Miss Piggy from Mumpets the kid is a toddler and spoiled dare devil. Now why do some people expected family members to be nannies?

Why do some parents expect relatives to provide free childcare?
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